To clarify this further: There are two key categories when the error 101 happens:
(1) “User Error” - this happens when you want to run a web page command while a non-web page (e. g. the Google New Page Tab or chrome://settings/) is open. This does not work, and the error tells you this. Starting with the next update, the error#101 message will link to this forum post to explain this to the users that see this error.
(2) Bug: 
It seems we have times when a web page is open in the browser, and you still get this error. I guess this happens when (for whatever reason, could be a bug) UIVision can not access the website. If this happens, please report it in this forum thread: [Recreator required] Error #101 - Unsolved mysteries Ideally you can describe how we can recreate this error or at least add a screencast of the issue. Once we can recreate the issue we will it asap.